RFC 2472 (rfc2472) - Page 2 of 14

IP Version 6 over PPP

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RFC 2472                 IP Version 6 over PPP             December 1998


   11     Full Copyright Statement ..............................   14

1.  Introduction

   PPP has three main components:

   1) A method for encapsulating datagrams over serial links.

   2) A Link Control Protocol (LCP) for establishing, configuring, and
     testing the data-link connection.

   3) A family of Network Control Protocols (NCPs) for establishing and
     configuring different network-layer protocols.

   In order to establish communications over a point-to-point link, each
   end of the PPP link must first send LCP packets to configure and test
   the data link.  After the link has been established and optional
   facilities have been negotiated as needed by the LCP, PPP must send
   NCP packets to choose and configure one or more network-layer
   protocols.  Once each of the chosen network-layer protocols has been
   configured, datagrams from each network-layer protocol can be sent
   over the link.

   In this document, the NCP for establishing and configuring the IPv6
   over PPP is referred as the IPv6 Control Protocol (IPV6CP).

   The link will remain configured for communications until explicit LCP
   or NCP packets close the link down, or until some external event
   occurs (power failure at the other end, carrier drop, etc.).

1.1.  Specification of Requirements

   In this document, several words are used to signify the requirements
   of the specification.

   The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT",
   "SHOULD", "SHOULD NOT", "RECOMMENDED", "MAY", and "OPTIONAL" in this
   document are to be interpreted as described in [7].

2.  Sending IPv6 Datagrams

   Before any IPv6 packets may be communicated, PPP MUST reach the
   Network-Layer Protocol phase, and the IPv6 Control Protocol MUST
   reach the Opened state.

   Exactly one IPv6 packet is encapsulated in the Information field of
   PPP Data Link Layer frames where the Protocol field indicates type
   hex 0057 (Internet Protocol Version 6).



Haskin & Allen              Standards Track
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